Coupling



Dec. 14 1926 H. T. SCQTT COUPLING Filed Dec. 3. 1924 www CII

Patented Dec. 14, 192@ lallED STATES HENRY T. SCOTT, OF HUNTSVILLE, TEXAS.

p COUPLING.

Application filed December 3, 1924. Serial No. 753.719.

This invention relates to improvements in couplings and has for an object the provision of means for quickly and securely connectinga drill bit or other tool to a stem in a manner to prevent accidental separation and probable loss ot the tool.

lilith the above and other objects in view, the invention further includes the following novel features and details oi" construction, to be hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings z* Figure 1 is an elevation partly in section illustrating' the invention.

Figure 2 is a like view at right angles to Figure 1.

Figures 3 and 4 are sections taken respectively on the lines 3 3 and ht of Figure 2.

Figure 5 is a detail perspective View of the coupling end ot the stein.

Figure 6 is a like view of t-lie recessed eX- tension oit the tool shank.

Figure l is a detail section taken transversely ot the shank extension.

Referring to the drawings in detail wherein like characters of reference denote correspendingv part-s, the reference character 1() indicates ,a portion olf a tool such as a drill bit, the shank of which is indicated at 11. The shank 11 is provided with a collar 12 and a reduced extension 13s while between this collar and the extension 13 is a threaded portion 14.

The extension 13 is substantially one-halll the diameter ot the shank 11 and is provided with spaced oppositely located recesses 15..

The reference .character 1G indicates a portion of a drill stem whose extremity is provided with a longitudinally extending `.groove 1'? which opens at the end of the stein. Tlieopposite side wallso'f the grooves 17 are provided with spaced recesses 18 so as to provide oppositely located. lugs 19. the V latter being' designed to be received within the recesses 15 so as to forni an interlocking engagement between the shank and stein.

This interlocking engagement between the shank and stein will prevent relative longii'f' tudinal movement and in order to prevent relative lateral movement there is provided a sleeve 2O which is provided at one end with a threaded counterbore 21 which adapted to engage the threaded portion 14 ot .the shank 11. The sleeve will thus be positioned over the interlocking` ends ot the stein and shank and will hold the same against accidental separation. Y

The invention isv susceptible ot various changes in its form, proportions and minor details of construction and the right is heiein reserved to make such changes as properly fall within the scope of the appended claim.

Having described the invention what is claimed is z* i Y In a tool coupling, a shank, a collar, a re-v duced 'extension atY one side of the collar, a threaded portion on the shank at the inner Til end ot the reduced extension, a substantially semi-circular portion on the reduced portion formed with oppositely located recesses, stein having; a longitudinally disposed groove therein, with spaced rece inthe side walls ot the groove torniingi` oppositely located lugs adapted to be positioned in the spaced recesses oit the reduced eiitension, a sleeve arranged over the interlocked portions of the shank and stem, said sleeve being' formed with a threaded counter bore. adapted for engagement with the threaded portion of the shank and having its outer end abutting` said collar.

In testimonywhereof I ailix my signature.

HENRY Tf SCOTT. 

